With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
vtpInternalVlanGrp
vtp Internal Vlan Group
1.3.6.1.4.1.9.9.46.3.2.32
A collection of objects providing information of internal VLANs.
Back to CISCO-VTP-MIB MIB page.
IPHost Network monitor allows you to monitor vtpInternalVlanGrp on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.